Cars pass under the display of the Chinese national flag in the 13.46km-long New Er Lang Shan Tunnel which connects Tianquan county in Ya'an city and Luding county in Garze Tibetan Autonomous Prefecture on the Yakang (Ya'an-Kangding) Expressway during the National Day holiday in southwest China's Sichuan province, 1 October 2018. Photo Imaginechina